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High Quality Content by WIKIPEDIA articles! Pleasants County is a county located in the U.S. state of West Virginia. As of 2010, the population was 7,605. Its county seat is St. Marys. It was created by the Virginia General Assembly in 1851 and named for US Senator and Virginia Governor James Pleasants, Jr. Pleasants County is included in the Parkersburg-Marietta-Vienna, West Virginia-Ohio (part) Metropolitan Statistical Area.